Gou, Pingping
(2012)
Metal ion and pH Sensors based on Carbon Nanotubes.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
The sensitive and selective detection of metal ions and pH levels is important in environmental and biomedical applications. Conventional methods are limited in their potential due to high cost, big size, and lack of portability. A new system incorporating single-walled carbon nanotubes (SWNTs) modified with polymers or proteins has been developed to create a cost-effective, easy-to-use metal ion/pH sensing platform. This system utilized SWNTs modified with metal ion/pH sensitive materials because pristine SWNTs are only sensitive to high concentrations of metal ions (> 1 mM), and strong base (pH > 12) or acid (pH < 2), and lack selectivity as well.
This work uses noncovalent functionalization approaches to chemically modify SWNTs because noncovalent modifications do not disrupt SWNT electronic properties. When the modified-SWNT system encounters metal ions or pH solutions, the alteration in modified layers, such as conformational change or charge transfer, initiates signal transduction processes, thus changing the electrical and optical properties of the underlying SWNTs. The properties of modified SWNTs were characterized by a variety of techniques including optical spectroscopy, and electrical transport measurements in solid state or liquid state, through which the transduction mechanism of the system was investigated.
The modified SWNT-based metal ion/pH sensors offer promise in applications and provide a platform for fundamental understanding of the transduction mechanism that help us to develop better chemical sensors in the future.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
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| ETD Committee: |
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| Date: |
18 June 2012 |
| Date Type: |
Publication |
| Defense Date: |
13 February 2012 |
| Approval Date: |
18 June 2012 |
| Submission Date: |
17 April 2012 |
| Access Restriction: |
1 year -- Restrict access to University of Pittsburgh for a period of 1 year. |
| Number of Pages: |
140 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Dietrich School of Arts and Sciences > Chemistry |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
single-walled carbon nanotubes, Noncovalently Modification, polyazomethine, poly(1-aminoanthracene), calmodulin, Bacterioferritin |
| Date Deposited: |
18 Jun 2012 15:39 |
| Last Modified: |
15 Nov 2016 13:57 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/11851 |
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